You have to add in the perception that if you pool enough dubious loans together they somehow cease to be dubious. Add that to a huge supply of free money (interest rate below inflation rate = free money), and the incentive to take risks on loans becomes overwhelming. If you set up a situation where people can borrow at 1.5% and lend at 7% with zero perceived risk, no amount of regulation or oversight is going to keep speculators from riding that out of control.
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